20123232123 has 4 divisors (see below), whose sum is σ = 26830976168. Its totient is φ = 13415488080.

The previous prime is 20123232119. The next prime is 20123232127. The reversal of 20123232123 is 32123232102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20123232119) and next prime (20123232127).

It is not a de Polignac number, because 20123232123 - 2² = 20123232119 is a prime.

It is a super-2 number, since 2×20123232123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123232123.

It is not an unprimeable number, because it can be changed into a prime (20123232127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353872018 + ... + 3353872023.

It is an arithmetic number, because the mean of its divisors is an integer number (6707744042).

Almost surely, 2^20123232123 is an apocalyptic number.

20123232123 is a deficient number, since it is larger than the sum of its proper divisors (6707744045).

20123232123 is an equidigital number, since it uses as much as digits as its factorization.

20123232123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707744044.

The product of its (nonzero) digits is 864, while the sum is 21.

Subtracting from 20123232123 its sum of digits (21), we obtain a palindrome (20123232102).

Adding to 20123232123 its reverse (32123232102), we get a palindrome (52246464225).

The spelling of 20123232123 in words is "twenty billion, one hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-three".